脱位后牙再植之后的治疗方案不正确的是（）

A.全身使用抗生素至少1周

B.3～4周内避免咬合力

C.若牙根未发育完成，应密切复诊观察牙根发育

D.若牙根发育完成，两周后拔髓行牙胶充填

E.复诊时间间隔可随着观察的推移而变长

Only after liberation       to be treated as human beings.

A．did they begin

B．they had begun

C．they did begin

D．had they begun